When using Oracle, the data dictionary provides us with tons of
tables and views, allowing us to fetch information about pretty
much anything within the database. We do have information like
that in MySQL 5.0 (and up) in the information_schema
database, but it’s scattered through several different tables.

Sometimes a client asks us to change the datatype of a column,
but forgets to mention the schema name, and sometimes even the
table name. As you can imagine, having this kind of information
is vital to locate the object and perform the requested
action. This kind of behaviour must be related to
…

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